My homebrew ESR meter spots a cap that is less than desirable. If anyone is interested I have my .asm code I am happy to share. The board is an Olimex prototyping development kit I got from ‘microcontrollershop’. It’s all assembler .. No C version and no desire to work on this anymore. The electrical aspects are documented in the code to some degree (enough that *I* could rebuild it…) I don’t have any plans for a kit. If you want the code you’ll have to agree that you’re building this project for yourself with no re-distribution. I don’t trust my code enough to be considered for some sort of commercial use.